Java Doc for GenericCache.java in  » Library » jakarta-oro-2.0.8 » org » apache » oro » util » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Library » jakarta oro 2.0.8 » org.apache.oro.util 
Source Cross Reference  Class Diagram Java Document (Java Doc) 


java.lang.Object
   org.apache.oro.util.GenericCache

All known Subclasses:   org.apache.oro.util.CacheFIFO,  org.apache.oro.util.CacheFIFO2,  org.apache.oro.util.CacheRandom,  org.apache.oro.util.CacheLRU,
GenericCache
abstract public class GenericCache implements Cache,java.io.Serializable(Code)
This is the base class for all cache implementations provided in the org.apache.oro.util package. To derive a subclass from GenericCache only the ... methods need be overridden. Although 4 subclasses of GenericCache are provided with this package, users may not derive subclasses from this class. Rather, users should create their own implmentations of the Cache interface.
version:
   @version@
since:
   1.0
See Also:   Cache
See Also:   CacheLRU
See Also:   CacheFIFO
See Also:   CacheFIFO2
See Also:   CacheRandom


Field Summary
final public static  intDEFAULT_CAPACITY
     The default capacity to be used by the GenericCache subclasses provided with this package.
 GenericCacheEntry[]_cache
    
 int_numEntries
    
 HashMap_table
    

Constructor Summary
 GenericCache(int capacity)
     The primary constructor for GenericCache.

Method Summary
abstract public  voidaddElement(Object key, Object value)
    
final public  intcapacity()
     Returns the maximum number of elements that can be cached at one time.
public synchronized  ObjectgetElement(Object key)
    
final public  booleanisFull()
    
final public  Iteratorkeys()
    
final public  intsize()
     Returns the number of elements in the cache, not to be confused with the GenericCache.capacity() which returns the number of elements that can be held in the cache at one time.

Field Detail
DEFAULT_CAPACITY
final public static int DEFAULT_CAPACITY(Code)
The default capacity to be used by the GenericCache subclasses provided with this package. Its value is 20.



_cache
GenericCacheEntry[] _cache(Code)



_numEntries
int _numEntries(Code)



_table
HashMap _table(Code)




Constructor Detail
GenericCache
GenericCache(int capacity)(Code)
The primary constructor for GenericCache. It has default access so it will only be used within the package. It initializes _table to a Hashtable of capacity equal to the capacity argument, _cache to an array of size equal to the capacity argument, and _numEntries to 0.


Parameters:
  capacity - The maximum capacity of the cache.





Method Detail
addElement
abstract public void addElement(Object key, Object value)(Code)



capacity
final public int capacity()(Code)
Returns the maximum number of elements that can be cached at one time.

The maximum number of elements that can be cached at one time.




getElement
public synchronized Object getElement(Object key)(Code)



isFull
final public boolean isFull()(Code)



keys
final public Iterator keys()(Code)



size
final public int size()(Code)
Returns the number of elements in the cache, not to be confused with the GenericCache.capacity() which returns the number of elements that can be held in the cache at one time.

The current size of the cache (i.e., the number of elementscurrently cached).




Methods inherited from java.lang.Object
native protected Object clone() throws CloneNotSupportedException(Code)(Java Doc)
public boolean equals(Object obj)(Code)(Java Doc)
protected void finalize() throws Throwable(Code)(Java Doc)
final native public Class getClass()(Code)(Java Doc)
native public int hashCode()(Code)(Java Doc)
final native public void notify()(Code)(Java Doc)
final native public void notifyAll()(Code)(Java Doc)
public String toString()(Code)(Java Doc)
final native public void wait(long timeout) throws InterruptedException(Code)(Java Doc)
final public void wait(long timeout, int nanos) throws InterruptedException(Code)(Java Doc)
final public void wait() throws InterruptedException(Code)(Java Doc)

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